Window Desktop client cannot connect

[stvn78]

We're having trouble with a Win 11 PC running the latest Zoom Desktop Client connecting. It sometimes works, so I think that rules out a big miss with a firewall, etc, but who knows... Usually it fails to connect, whether with an Ethernet cable or Wi-Fi. However, if I connect to my phone's Wi-Fi hot spot, it consistently works. From the same PC, connected again to the home network, the Web App from Firefox consistently works.

I've checked the Windows Firewall, the ATT router (BGW320-500), reset the PCs network, ... everything but a hammer. If it never connected I would look again at all of the firewall settings, but occasionally it does work. Help!

[storyhub]

I have the same modem. Try going to diagnostics > troubleshoot > click "run full diagnostics" and make sure everything passes. Next goto "test internet access" on the same page and enter "zoom.us" for the address then click traceroute and check the hops. Also run a ping test to see if there is any packet loss.

It is recommended that the Windows computer be configured with a fixed IP.

run the following URL to do a test meeting https://zoom.us/test

If this works please click accept as a solution.

[stvn78]

Thanks for your reply. 
Full diagnostics passed all. Traceroute listed 6 hops. Ping had zero loss, round-trip 8.6-10.3 ms. Finally, with a fixed IP address the Desktop client fails the test meeting. I then tell it to open in the browser and it does. (The Desktop client even fails to log in.) 

[stvn78]

Here's a new tidbit. When I run Zoom Client Healthcheck, the Network test/Service status reports, for both Meeting and Chat:

   Error code: 35

   SSL connect error

That certainly seems important, but I can find nothing about resolving it, or any further information about the error code or "SSL connect error". If the PC's SSL bits are a mess, they don't seem to affect anything but the Zoom Desktop.